A nonpartisan watchdog group Thursday called for a federal investigation of Hillary Clinton’s campaign committee, accusing it of illegally accepting millions of dollars worth of “opposition research” and other assistance from Correct the Record, an outside super-PAC, in violation of U.S. election laws.

The Campaign Legal Center also filed complaints with the Federal Election Commission to initiate probes of Donald Trump’s campaign, and two super-PACs backing it, for similar violations of laws barring “coordination” between political campaigns and outside groups.

But the Campaign Legal Center’s detailed 52-page complaint against Hillary for America and Correct the Record — part of the sprawling political empire run by Clinton backer David Brock — is likely to get special attention, given Clinton’s repeated advocacy of campaign finance reform. She has vowed to “curb the influence of big money in American politics” and to push for a constitutional amendment to overturn Citizens United — the controversial ruling that opened the door for groups such as Correct the Record to accept unlimited donations to benefit political candidates.